SYSTEMS AND METHODS FOR PERFORMING TRANSPORT I/O

摘要

Systems and methods for implementing a Transport I/O system are described. Network encrypted content may be received by a device. The device may provide the network encrypted content to a secure processor, such as, for example, a smart card. The secure processor obtains a network control word that may be used to decrypt the network encrypted content. The secure processor may decrypt the network encrypted content to produce clear content, in embodiments, the secure processor may then use a local control word to generate locally encrypted content specific to the device. The device may then receive the locally encrypted content from the secure processor and proceed to decrypt the locally encrypted content using a shared local encryption key. The Transport I/O system ensures the protection of the network control word by maintaining the network control word on the secure processor.

主权项

1. A removable security device for performing a method comprising:
receiving a first network encrypted elementary stream; receiving a second network encrypted elementary stream; decrypting the first and second network encrypted elementary streams using at least one network control and to generate first and second clear content streams; obtaining at least one local control word; encrypting the first and second clear content streams to produce first and second locally encrypted content streams, wherein the first and second locally encrypted content streams are generated using the at least one local control word; multiplexing the first and second locally encrypted content streams into an output stream; and providing, to a video processing device, the output stream.